'One punch' accused in Qld refused bail

A man who died from a single blow to the head had accused his alleged attacker of being a police informer, a court has heard.

Shane Skondin, 39, from Palm Beach, appeared in Southport Magistrates Court on Wednesday charged with the manslaughter of Robert Scott Newnham, 46, of Miami.

The court heard the pair argued outside Coles supermarket at Miami on Monday night after Mr Newnham accused Skondin of being a police informer.

Police prosecutor Jim Pedlow told the court CCTV footage showed Skondin followed Mr Newnham into the supermarket, where he pushed him in the back before punching him once in the face.

Sergeant Pedlow said the victim fell to the ground unconscious and Skondin walked around him and out of the supermarket as shoppers rushed to help.

Mr Newnham was taken to Gold Coast Hospital but died on Tuesday from head injuries.

Lawyer Bridget Patchell, applying for bail, conceded her client, who moved to the Gold Coast three months ago, had an extensive criminal history in NSW.

Magistrate Brian Kilmartin said Skondin, who is on parole for escaping from police custody in NSW, showed "callous disregard in the extreme" after the alleged attack and had an "extensive and dreadful" criminal history.